Skip hoist



Aprll 2L, 1929. A. WARNER SKIP Hos'r Filed Oct. 20, 1926 Patented Apr. 2, 1929.

UNITED STATES PATENT OFFICE.

ARTHUR WARNER, 0F HAVERFORD, PENNSYLVANIA, ASSIGNOR TO R. I-I. BEAUMONT COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYL- VANIA.

sx1? HoIsT.

The present invention relates to counterweighted and balanced skip hoist-s, and among its objects reference may be made to the following:

Smaller sizes of ropes, sheaves, shafts, winding machine drums, and gearing than heretofore can be used and considerable saving effected in the cost of that machinery; the impact of an empty bucket, when lowered into the loading pit, is considerably less and the jerk upon the motor is also less', and the uplift on the winding` machine foundation is considerably less, permitting of the use of lighter (smaller) foundations than at r present.

Other objects of the invention will appear from the following description at the end of which the invention will be claimed.

In the following description reference will be made to the accompanying drawing forming part hereof and in which Figure l is a side view diagrammatically illustrating a skip hoist embodying features of the invention, and

Figs. 2 and 3 are views in connection with which a detail illustrative description will be given.

Inthe drawing, more particularly Fig. 1, l is a winding machine. 2 is a bucket. 3 is a. counterweight. The winding machine l is connected by a rope or cable 4 with the bucket, and by an oppositely wound rope or cable 5 with the counterweight, and these ropes or cables 4 and 5 pass over sheaves at f the top of the tower 6. In general, these are parts of well known structures and according to this invention there is combined with them an overhead sheave 7 and an auxiliary cable 8 passing over the overhead sheave 7 and connected with the counterweight and bucket. As shown in Fig. l the connection to the counterweight is mad-e by means of an equalizing sheave 9, so that the cable 8 may be regarded as an extension of the cable 5. By way of further detail description the following may be said: Referring to Fig. 2 a description will be given under the conditions that the loaded bucket is rising. It is assumed that the weight of the bucket is B, of the loaded bucket is 2B, and of the counterweight 11/2B. C is the bottom of the bucket travel. The load on the rope 4 to drum l is ll/B arrived atin this way.

2B (the weight of the bucket) minus 1%]3 (half the weight of the counterweight) equals l/i. The load on the counterweight rope 5 is 7413. This is arrived at by taking one-half of the counterweight. The load on the tower is the sum of all the rope loads. is arrived at by adding the load on both right and lefthand reaches of rope 5 which equals l1/2B. Also the load on both reaches of S which equals llZB, also the load on both reaches of the rope 4 which equals S21/2B. rIhe combined load on the winder equals rope 4 (l1/LB) and rope 5 making the load on the winder 2B. rihe unbalanced load on the winder is 4 (l1/LB) minus 5 soy that-the unbalanced load is 1/2B.

When lowering the bucket (Fig. 3) the results are arrived at inthe manner above indicated but they differ because the load has been dumped at the top. In this case the tower load is l/ZB, the load on rope 4 is 1/B, the load'on rope 5 is 371GB, the combined load on Winder is 4 plus 5 which equals B. The unbalanced load on the winder is 5 minus 4 which equals l/ZB. rIhe impact of the empty bucket at the bottom C of the travel is due .to j/LB which is half the unbalanced load on the winder.

From these tables and by comparison wit-h known equipment those skilled in the art will understand the philosophy of the accomplishment of the objects herein s et forth. It may be said that the oounterweight should be of appropriate weight to provide a pull in the ropes less than the weight of the empty bucket, so that it will be overhauled automatically by the lowering of the empty bucket.

It will be obvious to those skilled in the art to which the invention relates that modifications may be made in details of construe tion and arrangement and in matters of mere form without departing from the spirit of the invention which is not limited to such matters or otherwise than th-e prior art and the appended claims may require.

I claim: o

1. An improved skip hoist including a winding machine, a bucket, a counterweight, an equalizing sheave on the counterweight, an overhead sheave and a cable passing from the winding machine to the bucket, thence to the overhead sheave, thence through the equalizng sheave, then returning to the to the eounterweight, an overhead sheave Winding maehine. and an auxiliary eablepassing over the over- 2. An improvement for skip hosts which head sheave and through the equalizing 10 ineiude a Winding inaehine and a bucket and sheave and connected to the eounteweight 5 a eounterweight each having cable conneeeabie,1nentioned above,as an extension theretion with the machine, Said improvement of and to the bucket. consisting of an equalizing she-ave attached ARTHUR WARNER. 

